<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" />
<title>ParentFirstTestCase xref</title>
<link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" />
</head>
<body>
<pre>

<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> * </em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> * </em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment"> */</em> 
<a name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> org.apache.commons.logging.pathable;
<a name="18" href="#18">18</a>  
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.net.URL;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.util.Arrays;
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.util.Enumeration;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.HashSet;
<a name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a name="25" href="#25">25</a>  
<a name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> junit.framework.Test;
<a name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> junit.framework.TestCase;
<a name="28" href="#28">28</a>  
<a name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.logging.PathableClassLoader;
<a name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.logging.PathableTestSuite;
<a name="31" href="#31">31</a>  
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">/**</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * Tests for the PathableTestSuite and PathableClassLoader functionality,</em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * where lookup order for the PathableClassLoader is parent-first.</em>
<a name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> * These tests assume:</em>
<a name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * &lt;ul&gt;</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> * &lt;li&gt;junit is in system classpath</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * &lt;li&gt;nothing else is in system classpath</em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> * &lt;/ul&gt;</em>
<a name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> */</em>
<a name="42" href="#42">42</a>  
<a name="43" href="#43">43</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/commons/logging/pathable/ParentFirstTestCase.html">ParentFirstTestCase</a> <strong class="jxr_keyword">extends</strong> TestCase {
<a name="44" href="#44">44</a>      
<a name="45" href="#45">45</a>      <em class="jxr_javadoccomment">/**</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment">     * Set up a custom classloader hierarchy for this test case.</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment">     * The hierarchy is:</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment">     * &lt;ul&gt;</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment">     * &lt;li&gt; contextloader: parent-first.</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment">     * &lt;li&gt; childloader: parent-first, used to load test case.</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment">     * &lt;li&gt; parentloader: parent-first, parent is the bootclassloader.</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">     * &lt;/ul&gt;</em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment">     */</em>
<a name="54" href="#54">54</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> Test suite() <strong class="jxr_keyword">throws</strong> Exception {
<a name="55" href="#55">55</a>          Class thisClass = ParentFirstTestCase.<strong class="jxr_keyword">class</strong>;
<a name="56" href="#56">56</a>          ClassLoader thisClassLoader = thisClass.getClassLoader();
<a name="57" href="#57">57</a>  
<a name="58" href="#58">58</a>          <em class="jxr_comment">// Make the parent a direct child of the bootloader to hide all</em>
<a name="59" href="#59">59</a>          <em class="jxr_comment">// other classes in the system classpath</em>
<a name="60" href="#60">60</a>          <a href="../../../../../org/apache/commons/logging/PathableClassLoader.html">PathableClassLoader</a> parent = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/commons/logging/PathableClassLoader.html">PathableClassLoader</a>(<strong class="jxr_keyword">null</strong>);
<a name="61" href="#61">61</a>          
<a name="62" href="#62">62</a>          <em class="jxr_comment">// Make the junit classes visible as a special case, as junit</em>
<a name="63" href="#63">63</a>          <em class="jxr_comment">// won't be able to call this class at all without this. The</em>
<a name="64" href="#64">64</a>          <em class="jxr_comment">// junit classes must be visible from the classloader that loaded</em>
<a name="65" href="#65">65</a>          <em class="jxr_comment">// this class, so use that as the source for future access to classes</em>
<a name="66" href="#66">66</a>          <em class="jxr_comment">// from the junit package.</em>
<a name="67" href="#67">67</a>          parent.useExplicitLoader(<span class="jxr_string">"junit."</span>, thisClassLoader);
<a name="68" href="#68">68</a>          
<a name="69" href="#69">69</a>          <em class="jxr_comment">// make the commons-logging.jar classes visible via the parent</em>
<a name="70" href="#70">70</a>          parent.addLogicalLib(<span class="jxr_string">"commons-logging"</span>);
<a name="71" href="#71">71</a>          
<a name="72" href="#72">72</a>          <em class="jxr_comment">// create a child classloader to load the test case through</em>
<a name="73" href="#73">73</a>          <a href="../../../../../org/apache/commons/logging/PathableClassLoader.html">PathableClassLoader</a> child = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/commons/logging/PathableClassLoader.html">PathableClassLoader</a>(parent);
<a name="74" href="#74">74</a>          
<a name="75" href="#75">75</a>          <em class="jxr_comment">// obviously, the child classloader needs to have the test classes</em>
<a name="76" href="#76">76</a>          <em class="jxr_comment">// in its path!</em>
<a name="77" href="#77">77</a>          child.addLogicalLib(<span class="jxr_string">"testclasses"</span>);
<a name="78" href="#78">78</a>          child.addLogicalLib(<span class="jxr_string">"commons-logging-adapters"</span>);
<a name="79" href="#79">79</a>          
<a name="80" href="#80">80</a>          <em class="jxr_comment">// create a third classloader to be the context classloader.</em>
<a name="81" href="#81">81</a>          <a href="../../../../../org/apache/commons/logging/PathableClassLoader.html">PathableClassLoader</a> context = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/commons/logging/PathableClassLoader.html">PathableClassLoader</a>(child);
<a name="82" href="#82">82</a>  
<a name="83" href="#83">83</a>          <em class="jxr_comment">// reload this class via the child classloader</em>
<a name="84" href="#84">84</a>          Class testClass = child.loadClass(thisClass.getName());
<a name="85" href="#85">85</a>          
<a name="86" href="#86">86</a>          <em class="jxr_comment">// and return our custom TestSuite class</em>
<a name="87" href="#87">87</a>          <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/commons/logging/PathableTestSuite.html">PathableTestSuite</a>(testClass, context);
<a name="88" href="#88">88</a>      }
<a name="89" href="#89">89</a>      
<a name="90" href="#90">90</a>      <em class="jxr_javadoccomment">/**</em>
<a name="91" href="#91">91</a>  <em class="jxr_javadoccomment">     * Utility method to return the set of all classloaders in the</em>
<a name="92" href="#92">92</a>  <em class="jxr_javadoccomment">     * parent chain starting from the one that loaded the class for</em>
<a name="93" href="#93">93</a>  <em class="jxr_javadoccomment">     * this object instance.</em>
<a name="94" href="#94">94</a>  <em class="jxr_javadoccomment">     */</em>
<a name="95" href="#95">95</a>      <strong class="jxr_keyword">private</strong> Set getAncestorCLs() {
<a name="96" href="#96">96</a>          Set s = <strong class="jxr_keyword">new</strong> HashSet();
<a name="97" href="#97">97</a>          ClassLoader cl = <strong class="jxr_keyword">this</strong>.getClass().getClassLoader();
<a name="98" href="#98">98</a>          <strong class="jxr_keyword">while</strong> (cl != <strong class="jxr_keyword">null</strong>) {
<a name="99" href="#99">99</a>              s.add(cl);
<a name="100" href="#100">100</a>             cl = cl.getParent();
<a name="101" href="#101">101</a>         }
<a name="102" href="#102">102</a>         <strong class="jxr_keyword">return</strong> s;
<a name="103" href="#103">103</a>     }
<a name="104" href="#104">104</a> 
<a name="105" href="#105">105</a>     <em class="jxr_javadoccomment">/**</em>
<a name="106" href="#106">106</a> <em class="jxr_javadoccomment">     * Test that the classloader hierarchy is as expected, and that</em>
<a name="107" href="#107">107</a> <em class="jxr_javadoccomment">     * calling loadClass() on various classloaders works as expected.</em>
<a name="108" href="#108">108</a> <em class="jxr_javadoccomment">     * Note that for this test case, parent-first classloading is</em>
<a name="109" href="#109">109</a> <em class="jxr_javadoccomment">     * in effect.</em>
<a name="110" href="#110">110</a> <em class="jxr_javadoccomment">     */</em>
<a name="111" href="#111">111</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testPaths() <strong class="jxr_keyword">throws</strong> Exception {
<a name="112" href="#112">112</a>         <em class="jxr_comment">// the context classloader is not expected to be null</em>
<a name="113" href="#113">113</a>         ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
<a name="114" href="#114">114</a>         assertNotNull(<span class="jxr_string">"Context classloader is null"</span>, contextLoader);
<a name="115" href="#115">115</a>         assertEquals(<span class="jxr_string">"Context classloader has unexpected type"</span>,
<a name="116" href="#116">116</a>                 PathableClassLoader.<strong class="jxr_keyword">class</strong>.getName(),
<a name="117" href="#117">117</a>                 contextLoader.getClass().getName());
<a name="118" href="#118">118</a>         
<a name="119" href="#119">119</a>         <em class="jxr_comment">// the classloader that loaded this class is obviously not null</em>
<a name="120" href="#120">120</a>         ClassLoader thisLoader = <strong class="jxr_keyword">this</strong>.getClass().getClassLoader();
<a name="121" href="#121">121</a>         assertNotNull(<span class="jxr_string">"thisLoader is null"</span>, thisLoader);
<a name="122" href="#122">122</a>         assertEquals(<span class="jxr_string">"thisLoader has unexpected type"</span>,
<a name="123" href="#123">123</a>                 PathableClassLoader.<strong class="jxr_keyword">class</strong>.getName(),
<a name="124" href="#124">124</a>                 thisLoader.getClass().getName());
<a name="125" href="#125">125</a>         
<a name="126" href="#126">126</a>         <em class="jxr_comment">// the suite method specified that the context classloader's parent</em>
<a name="127" href="#127">127</a>         <em class="jxr_comment">// is the loader that loaded this test case.</em>
<a name="128" href="#128">128</a>         assertSame(<span class="jxr_string">"Context classloader is not child of thisLoader"</span>,
<a name="129" href="#129">129</a>                 thisLoader, contextLoader.getParent());
<a name="130" href="#130">130</a> 
<a name="131" href="#131">131</a>         <em class="jxr_comment">// thisLoader's parent should be available</em>
<a name="132" href="#132">132</a>         ClassLoader parentLoader = thisLoader.getParent();
<a name="133" href="#133">133</a>         assertNotNull(<span class="jxr_string">"Parent classloader is null"</span>, parentLoader);
<a name="134" href="#134">134</a>         assertEquals(<span class="jxr_string">"Parent classloader has unexpected type"</span>,
<a name="135" href="#135">135</a>                 PathableClassLoader.<strong class="jxr_keyword">class</strong>.getName(),
<a name="136" href="#136">136</a>                 parentLoader.getClass().getName());
<a name="137" href="#137">137</a>         
<a name="138" href="#138">138</a>         <em class="jxr_comment">// parent should have a parent of null</em>
<a name="139" href="#139">139</a>         assertNull(<span class="jxr_string">"Parent classloader has non-null parent"</span>, parentLoader.getParent());
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>         <em class="jxr_comment">// getSystemClassloader is not a PathableClassLoader; it's of a</em>
<a name="142" href="#142">142</a>         <em class="jxr_comment">// built-in type. This also verifies that system classloader is none of</em>
<a name="143" href="#143">143</a>         <em class="jxr_comment">// (context, child, parent).</em>
<a name="144" href="#144">144</a>         ClassLoader systemLoader = ClassLoader.getSystemClassLoader();
<a name="145" href="#145">145</a>         assertNotNull(<span class="jxr_string">"System classloader is null"</span>, systemLoader);
<a name="146" href="#146">146</a>         assertFalse(<span class="jxr_string">"System classloader has unexpected type"</span>,
<a name="147" href="#147">147</a>                 PathableClassLoader.<strong class="jxr_keyword">class</strong>.getName().equals(
<a name="148" href="#148">148</a>                         systemLoader.getClass().getName()));
<a name="149" href="#149">149</a> 
<a name="150" href="#150">150</a>         <em class="jxr_comment">// junit classes should be visible; their classloader is not</em>
<a name="151" href="#151">151</a>         <em class="jxr_comment">// in the hierarchy of parent classloaders for this class,</em>
<a name="152" href="#152">152</a>         <em class="jxr_comment">// though it is accessable due to trickery in the PathableClassLoader.</em>
<a name="153" href="#153">153</a>         Class junitTest = contextLoader.loadClass(<span class="jxr_string">"junit.framework.Test"</span>);
<a name="154" href="#154">154</a>         Set ancestorCLs = getAncestorCLs();
<a name="155" href="#155">155</a>         assertFalse(<span class="jxr_string">"Junit not loaded by ancestor classloader"</span>, 
<a name="156" href="#156">156</a>                 ancestorCLs.contains(junitTest.getClassLoader()));
<a name="157" href="#157">157</a> 
<a name="158" href="#158">158</a>         <em class="jxr_comment">// jcl api classes should be visible only via the parent</em>
<a name="159" href="#159">159</a>         Class logClass = contextLoader.loadClass(<span class="jxr_string">"org.apache.commons.logging.Log"</span>);
<a name="160" href="#160">160</a>         assertSame(<span class="jxr_string">"Log class not loaded via parent"</span>,
<a name="161" href="#161">161</a>                 logClass.getClassLoader(), parentLoader);
<a name="162" href="#162">162</a> 
<a name="163" href="#163">163</a>         <em class="jxr_comment">// jcl adapter classes should be visible via both parent and child. However</em>
<a name="164" href="#164">164</a>         <em class="jxr_comment">// as the classloaders are parent-first we should see the parent one.</em>
<a name="165" href="#165">165</a>         Class log4jClass = contextLoader.loadClass(<span class="jxr_string">"org.apache.commons.logging.impl.Log4JLogger"</span>);
<a name="166" href="#166">166</a>         assertSame(<span class="jxr_string">"Log4JLogger not loaded via parent"</span>, 
<a name="167" href="#167">167</a>                 log4jClass.getClassLoader(), parentLoader);
<a name="168" href="#168">168</a>         
<a name="169" href="#169">169</a>         <em class="jxr_comment">// test classes should be visible via the child only</em>
<a name="170" href="#170">170</a>         Class testClass = contextLoader.loadClass(<span class="jxr_string">"org.apache.commons.logging.PathableTestSuite"</span>);
<a name="171" href="#171">171</a>         assertSame(<span class="jxr_string">"PathableTestSuite not loaded via child"</span>, 
<a name="172" href="#172">172</a>                 testClass.getClassLoader(), thisLoader);
<a name="173" href="#173">173</a>         
<a name="174" href="#174">174</a>         <em class="jxr_comment">// test loading of class that is not available</em>
<a name="175" href="#175">175</a>         <strong class="jxr_keyword">try</strong> {
<a name="176" href="#176">176</a>             Class noSuchClass = contextLoader.loadClass(<span class="jxr_string">"no.such.class"</span>);
<a name="177" href="#177">177</a>             fail(<span class="jxr_string">"Class no.such.class is unexpectedly available"</span>);
<a name="178" href="#178">178</a>             assertNotNull(noSuchClass); <em class="jxr_comment">// silence warning about unused var</em>
<a name="179" href="#179">179</a>         } <strong class="jxr_keyword">catch</strong>(ClassNotFoundException ex) {
<a name="180" href="#180">180</a>             <em class="jxr_comment">// ok</em>
<a name="181" href="#181">181</a>         }
<a name="182" href="#182">182</a> 
<a name="183" href="#183">183</a>         <em class="jxr_comment">// String class classloader is null</em>
<a name="184" href="#184">184</a>         Class stringClass = contextLoader.loadClass(<span class="jxr_string">"java.lang.String"</span>);
<a name="185" href="#185">185</a>         assertNull(<span class="jxr_string">"String class classloader is not null!"</span>,
<a name="186" href="#186">186</a>                 stringClass.getClassLoader());
<a name="187" href="#187">187</a>     }
<a name="188" href="#188">188</a>     
<a name="189" href="#189">189</a>     <em class="jxr_javadoccomment">/**</em>
<a name="190" href="#190">190</a> <em class="jxr_javadoccomment">     * Test that the various flavours of ClassLoader.getResource work as expected.</em>
<a name="191" href="#191">191</a> <em class="jxr_javadoccomment">     */</em>
<a name="192" href="#192">192</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testResource() {
<a name="193" href="#193">193</a>         URL resource;
<a name="194" href="#194">194</a>         
<a name="195" href="#195">195</a>         ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
<a name="196" href="#196">196</a>         ClassLoader childLoader = contextLoader.getParent();
<a name="197" href="#197">197</a>         
<a name="198" href="#198">198</a>         <em class="jxr_comment">// getResource where it doesn't exist</em>
<a name="199" href="#199">199</a>         resource = childLoader.getResource(<span class="jxr_string">"nosuchfile"</span>);
<a name="200" href="#200">200</a>         assertNull(<span class="jxr_string">"Non-null URL returned for invalid resource name"</span>, resource);
<a name="201" href="#201">201</a> 
<a name="202" href="#202">202</a>         <em class="jxr_comment">// getResource where it is accessable only to parent classloader</em>
<a name="203" href="#203">203</a>         resource = childLoader.getResource(<span class="jxr_string">"org/apache/commons/logging/Log.class"</span>);
<a name="204" href="#204">204</a>         assertNotNull(<span class="jxr_string">"Unable to locate Log.class resource"</span>, resource);
<a name="205" href="#205">205</a>         
<a name="206" href="#206">206</a>         <em class="jxr_comment">// getResource where it is accessable only to child classloader</em>
<a name="207" href="#207">207</a>         resource = childLoader.getResource(<span class="jxr_string">"org/apache/commons/logging/PathableTestSuite.class"</span>);
<a name="208" href="#208">208</a>         assertNotNull(<span class="jxr_string">"Unable to locate PathableTestSuite.class resource"</span>, resource);
<a name="209" href="#209">209</a> 
<a name="210" href="#210">210</a>         <em class="jxr_comment">// getResource where it is accessable to both classloaders. The one visible</em>
<a name="211" href="#211">211</a>         <em class="jxr_comment">// to the parent should be returned. The URL returned will be of form</em>
<a name="212" href="#212">212</a>         <em class="jxr_comment">//  jar:file:/x/y.jar!path/to/resource. The filename part should include the jarname</em>
<a name="213" href="#213">213</a>         <em class="jxr_comment">// of form commons-logging-nnnn.jar, not commons-logging-adapters-nnnn.jar</em>
<a name="214" href="#214">214</a>         resource = childLoader.getResource(<span class="jxr_string">"org/apache/commons/logging/impl/Log4JLogger.class"</span>);
<a name="215" href="#215">215</a>         assertNotNull(<span class="jxr_string">"Unable to locate Log4JLogger.class resource"</span>, resource);
<a name="216" href="#216">216</a>         assertTrue(<span class="jxr_string">"Incorrect source for Log4JLogger class"</span>,
<a name="217" href="#217">217</a>                 resource.toString().indexOf(<span class="jxr_string">"/commons-logging-1."</span>) &gt; 0);
<a name="218" href="#218">218</a>     }
<a name="219" href="#219">219</a>     
<a name="220" href="#220">220</a>     <em class="jxr_javadoccomment">/**</em>
<a name="221" href="#221">221</a> <em class="jxr_javadoccomment">     * Test that the various flavours of ClassLoader.getResources work as expected.</em>
<a name="222" href="#222">222</a> <em class="jxr_javadoccomment">     */</em>
<a name="223" href="#223">223</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testResources() <strong class="jxr_keyword">throws</strong> Exception {
<a name="224" href="#224">224</a>         Enumeration resources;
<a name="225" href="#225">225</a>         URL[] urls;
<a name="226" href="#226">226</a>         
<a name="227" href="#227">227</a>         <em class="jxr_comment">// verify the classloader hierarchy</em>
<a name="228" href="#228">228</a>         ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
<a name="229" href="#229">229</a>         ClassLoader childLoader = contextLoader.getParent();
<a name="230" href="#230">230</a>         ClassLoader parentLoader = childLoader.getParent();
<a name="231" href="#231">231</a>         ClassLoader bootLoader = parentLoader.getParent();
<a name="232" href="#232">232</a>         assertNull(<span class="jxr_string">"Unexpected classloader hierarchy"</span>, bootLoader);
<a name="233" href="#233">233</a>         
<a name="234" href="#234">234</a>         <em class="jxr_comment">// getResources where no instances exist</em>
<a name="235" href="#235">235</a>         resources = childLoader.getResources(<span class="jxr_string">"nosuchfile"</span>);
<a name="236" href="#236">236</a>         urls = toURLArray(resources);
<a name="237" href="#237">237</a>         assertEquals(<span class="jxr_string">"Non-null URL returned for invalid resource name"</span>, 0, urls.length);
<a name="238" href="#238">238</a>         
<a name="239" href="#239">239</a>         <em class="jxr_comment">// getResources where the resource only exists in the parent</em>
<a name="240" href="#240">240</a>         resources = childLoader.getResources(<span class="jxr_string">"org/apache/commons/logging/Log.class"</span>);
<a name="241" href="#241">241</a>         urls = toURLArray(resources);
<a name="242" href="#242">242</a>         assertEquals(<span class="jxr_string">"Unexpected number of Log.class resources found"</span>, 1, urls.length);
<a name="243" href="#243">243</a>         
<a name="244" href="#244">244</a>         <em class="jxr_comment">// getResources where the resource only exists in the child</em>
<a name="245" href="#245">245</a>         resources = childLoader.getResources(<span class="jxr_string">"org/apache/commons/logging/PathableTestSuite.class"</span>);
<a name="246" href="#246">246</a>         urls = toURLArray(resources);
<a name="247" href="#247">247</a>         assertEquals(<span class="jxr_string">"Unexpected number of PathableTestSuite.class resources found"</span>, 1, urls.length);
<a name="248" href="#248">248</a>         
<a name="249" href="#249">249</a>         <em class="jxr_comment">// getResources where the resource exists in both.</em>
<a name="250" href="#250">250</a>         <em class="jxr_comment">// resources should be returned in order (parent-resource, child-resource)</em>
<a name="251" href="#251">251</a>         resources = childLoader.getResources(<span class="jxr_string">"org/apache/commons/logging/impl/Log4JLogger.class"</span>);
<a name="252" href="#252">252</a>         urls = toURLArray(resources);
<a name="253" href="#253">253</a>         assertEquals(<span class="jxr_string">"Unexpected number of Log4JLogger.class resources found"</span>, 2, urls.length);
<a name="254" href="#254">254</a>         
<a name="255" href="#255">255</a>         <em class="jxr_comment">// There is no gaurantee about the ordering of results returned from getResources</em>
<a name="256" href="#256">256</a>         <em class="jxr_comment">// To make this test portable across JVMs, sort the string to give them a known order</em>
<a name="257" href="#257">257</a>         String[] urlsToStrings = <strong class="jxr_keyword">new</strong> String[2];
<a name="258" href="#258">258</a>         urlsToStrings[0] = urls[0].toString();
<a name="259" href="#259">259</a>         urlsToStrings[1] = urls[1].toString();
<a name="260" href="#260">260</a>         Arrays.sort(urlsToStrings);
<a name="261" href="#261">261</a>         assertTrue(<span class="jxr_string">"Incorrect source for Log4JLogger class"</span>,
<a name="262" href="#262">262</a>                 urlsToStrings[0].indexOf(<span class="jxr_string">"/commons-logging-1."</span>) &gt; 0);
<a name="263" href="#263">263</a>         assertTrue(<span class="jxr_string">"Incorrect source for Log4JLogger class"</span>,
<a name="264" href="#264">264</a>                 urlsToStrings[1].indexOf(<span class="jxr_string">"/commons-logging-adapters-1."</span>) &gt; 0);
<a name="265" href="#265">265</a>         
<a name="266" href="#266">266</a>     }
<a name="267" href="#267">267</a> 
<a name="268" href="#268">268</a>     <em class="jxr_javadoccomment">/**</em>
<a name="269" href="#269">269</a> <em class="jxr_javadoccomment">     * Utility method to convert an enumeration-of-URLs into an array of URLs.</em>
<a name="270" href="#270">270</a> <em class="jxr_javadoccomment">     */</em>
<a name="271" href="#271">271</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> URL[] toURLArray(Enumeration e) {
<a name="272" href="#272">272</a>         ArrayList l = <strong class="jxr_keyword">new</strong> ArrayList();
<a name="273" href="#273">273</a>         <strong class="jxr_keyword">while</strong> (e.hasMoreElements()) {
<a name="274" href="#274">274</a>             URL u = (URL) e.nextElement();
<a name="275" href="#275">275</a>             l.add(u);
<a name="276" href="#276">276</a>         }
<a name="277" href="#277">277</a>         URL[] tmp = <strong class="jxr_keyword">new</strong> URL[l.size()];
<a name="278" href="#278">278</a>         <strong class="jxr_keyword">return</strong> (URL[]) l.toArray(tmp);
<a name="279" href="#279">279</a>     }
<a name="280" href="#280">280</a> 
<a name="281" href="#281">281</a>     <em class="jxr_javadoccomment">/**</em>
<a name="282" href="#282">282</a> <em class="jxr_javadoccomment">     * Test that getResourceAsStream works.</em>
<a name="283" href="#283">283</a> <em class="jxr_javadoccomment">     */</em>
<a name="284" href="#284">284</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testResourceAsStream() <strong class="jxr_keyword">throws</strong> Exception {
<a name="285" href="#285">285</a>         java.io.InputStream is;
<a name="286" href="#286">286</a>         
<a name="287" href="#287">287</a>         <em class="jxr_comment">// verify the classloader hierarchy</em>
<a name="288" href="#288">288</a>         ClassLoader contextLoader = Thread.currentThread().getContextClassLoader();
<a name="289" href="#289">289</a>         ClassLoader childLoader = contextLoader.getParent();
<a name="290" href="#290">290</a>         ClassLoader parentLoader = childLoader.getParent();
<a name="291" href="#291">291</a>         ClassLoader bootLoader = parentLoader.getParent();
<a name="292" href="#292">292</a>         assertNull(<span class="jxr_string">"Unexpected classloader hierarchy"</span>, bootLoader);
<a name="293" href="#293">293</a>         
<a name="294" href="#294">294</a>         <em class="jxr_comment">// getResourceAsStream where no instances exist</em>
<a name="295" href="#295">295</a>         is = childLoader.getResourceAsStream(<span class="jxr_string">"nosuchfile"</span>);
<a name="296" href="#296">296</a>         assertNull(<span class="jxr_string">"Invalid resource returned non-null stream"</span>, is);
<a name="297" href="#297">297</a>         
<a name="298" href="#298">298</a>         <em class="jxr_comment">// getResourceAsStream where resource does exist</em>
<a name="299" href="#299">299</a>         is = childLoader.getResourceAsStream(<span class="jxr_string">"org/apache/commons/logging/Log.class"</span>);
<a name="300" href="#300">300</a>         assertNotNull(<span class="jxr_string">"Null returned for valid resource"</span>, is);
<a name="301" href="#301">301</a>         is.close();
<a name="302" href="#302">302</a>         
<a name="303" href="#303">303</a>         <em class="jxr_comment">// It would be nice to test parent-first ordering here, but that would require</em>
<a name="304" href="#304">304</a>         <em class="jxr_comment">// having a resource with the same name in both the parent and child loaders,</em>
<a name="305" href="#305">305</a>         <em class="jxr_comment">// but with different contents. That's a little tricky to set up so we'll</em>
<a name="306" href="#306">306</a>         <em class="jxr_comment">// skip that for now.</em>
<a name="307" href="#307">307</a>     }
<a name="308" href="#308">308</a> }
</pre>
<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
</html>

